P1520 — Lexus — Stop Lamp Switch Malfunction

P1520 (Lexus): Stop Lamp Switch Malfunction — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Stop Lamp Switch Malfunction. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain

Symptoms

  • Brake lamps off or continuously lit.

Possible causes

  • Faulty brake switch; damaged wiring.

What to check

  • Have the circuit, connectors and fuse checked professionally.